MMMosaic bug fix

[k-washi]

Fix index of image_scale with y2 with bottom_left implemented in _mosaic_combine

Motivation

MMMosaic bug fix

Original Traceback (most recent call last):
  File "/opt/conda/lib/python3.9/site-packages/torch/utils/data/_utils/worker.py", line 302, in _worker_loop
    data = fetcher.fetch(index)
  File "/opt/conda/lib/python3.9/site-packages/torch/utils/data/_utils/fetch.py", line 49, in fetch
    data = [self.dataset[idx] for idx in possibly_batched_index]
  File "/opt/conda/lib/python3.9/site-packages/torch/utils/data/_utils/fetch.py", line 49, in <listcomp>
    data = [self.dataset[idx] for idx in possibly_batched_index]
  File "/home/ubuntu/zrn_road_sign_detection_experiments/EasyCV/package/easycv/datasets/detection/mix.py", line 107, in __getitem__
    results = transform(results)
  File "/home/ubuntu/zrn_road_sign_detection_experiments/EasyCV/package/easycv/datasets/detection/pipelines/mm_transforms.py", line 109, in __call__
    results = self._mosaic_transform(results)
  File "/home/ubuntu/zrn_road_sign_detection_experiments/EasyCV/package/easycv/datasets/detection/pipelines/mm_transforms.py", line 174, in _mosaic_transform
    mosaic_img[y1_p:y2_p, x1_p:x2_p] = img_i[y1_c:y2_c, x1_c:x2_c]
ValueError: could not broadcast input array from shape (1333,1819,3) into shape (1291,1819,3)

Modification

Fixed image_scale index from 1 to 0

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[wenmengzhou]

please merge master and rerun the lint test